The population problem may be the 1 one of the world today． The world's population is growing 2 ． Two thousand years ago, there were only 250 million people 3 the earth． Four hundred years ago, the number was 4 500 million． But at the beginning of the 5 century, the world's population was about 1,700 million．In 1970, this number was 3,600 million． In 1990, the number was five billion． A 6 report says that the world population will 7 six billion by the end of the 20th century． This is just ten 8 after it 9 five billion． People say that by the year 2010, 1 0 may be seven billion．
( )1．A．great B．greater C．greatest D．greating
( )2．A．faster and faster B．fast and fast
C．fastest and fastest D．faster and fast
( )3.A．in B．on C．at D．for
( )4．A．nearly B．more C．almost D．over
( )5．A．twenty B．twelve C．twentieth D．twelfth
( )6．A．USA B．UN C．PRC D．PLA
( )7．A．past B．pass C．passed D．passes
( )8．A．weeks B．months C．seasons D．years
( )9．A．get B．gets C．reached D．reach
( )10．A．this B．its C．one D．it
20 1-5 CABDC 6-10 BBDCD